I don't work for Adobe, but my guesses are:
1. (Nice way to say it...) Not a big enough market. (Not so nice...) Chrome isn't really an OS.
2. Chrome implementations don't have enough power to run most of these apps well.
Now, having said this, it might be interesting to see the Creative Cloud "mobile" apps ported to Chrome.
You must be talking about this:
I think Shermbo's comment about not a big enough market is accurate. We've gotten requests for supporting the Blackberry playbook OS as well. I don't know that much about the Chrome OS personally, but it looks like it might have some interoperability with the Android OS (both from Google). If Android apps are supported, you might be able to use some of the Android versions of Adobe touch apps within that OS (pure speculation on my part).
Feel free to create an idea thread as a feature request. Idea posts are seen by our developers - as well as it gives others that like the idea an opportunity to add their vote to help us gauge overall customer interest.